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Docker is a set of platform as a service (PaaS) products that use OS-level virtualization to deliver software in packages called containers. [5] The service has both free and premium tiers. The software that hosts the containers is called Docker Engine. [6] It was first released in 2013 and is developed by Docker, Inc. [7]
This strategy enables Docker's lightweight images, as only layer updates need to be propagated (compared to full VMs, for example). [5] UbuntuLTSP, the Linux Terminal Server Project implementation for Ubuntu, uses Unionfs when PXE booting thin or thick clients. [6]
Alpine Linux is a Linux distribution designed to be small, simple, and secure. [3] It uses musl, BusyBox, and OpenRC instead of the more commonly used glibc, GNU Core Utilities, and systemd.
Container Linux provides no package manager as a way for distributing payload applications, requiring instead all applications to run inside their containers. Serving as a single control host, a Container Linux instance uses the underlying operating-system-level virtualization features of the Linux kernel to create and configure multiple containers that perform as isolated Linux systems.
Aufs is included in Debian "Jessie" (v8) and Ubuntu 16.04 out of the box. Debian "Stretch" (v9) does not include aufs anymore, but provides a package aufs-dkms, which auto-compiles the aufs kernel module using Dell's dkms. Docker originally used aufs for container filesystem layers.
Docker; Installable Live CD/USB: a hybrid ISO image which can be burned to either CD or USB [7] and used to install on both bare metal (I.e. a non-virtualized physical machine) and virtual machines, including VMware, Xen, XenServer, VirtualBox, and KVM. This image can also run live in non-persistent demo mode.
Unraid utilizes Docker to allow users to create and manage Docker containers to host applications on the system. In doing so, this allows Unraid users to host applications that may not support the Unraid operating system directly, could be difficult to install & remove, or may not behave correctly with other applications running on the same system.
Vagrant is a source-available software product for building and maintaining portable virtual software development environments; [5] e.g., for VirtualBox, KVM, Hyper-V, Docker containers, VMware, Parallels, and AWS. It tries to simplify the software configuration management of virtualization in order to increase development productivity.